Terms & DefinitionsHeat Affected Zone What do I look for? What equipment do I need? How do I interpret the code or standard requirements? What is the nature of the product? What operating conditions will be present? What is the quality of welding required? Is there a code or standard available to inspect the welds against Visual Inspection Procedures Interpass temperature Consumable control During Welding Excess weld metal Actual throat thickness Design throat thickness 4mm 6mm 8mm 4mm (a) (b) 4mm 4mm 6mm 6mm (a) (b) 2 The volume of (b) is over double the volume of (a) Without the extra reinforcement being added 4mm 4mm 6mm 6mm (a) (b) The Leg length is 14mm what is the Throat? 10mm 14mm Fillet welds connecting parts with fusion faces with an angle more than 1200 or less than 600 should not use the above calculations Copyright © 2004, TWI Ltd Features to Consider The design throat thickness of a flat or convex fillet weld connecting parts with the fusion faces which form an angle between 600 and 1200 may be calculated by multiplying the leg length by the appropriate factors as given below Angle between fusion faces in degrees Factor 60 to 90 91 to 100 101 to 106 107 to 113 114 to 120 0.7 0.65 0.6 0.55 0.5 Copyright © 2004, TWI Ltd Features to Consider